The resolution of a feedback sensor (or the resolution of a response measurement

Question

The resolution of a feedback sensor (or the resolution of a response measurement used in feedback) has a direct effect on the accuracy that is achievable in a control system. This is true because the controller cannot correct a deviation of the response from the desired value (set point) unless the response sensor can detect that change. It follows that the resolution of a feedback sensor will govern the minimum (best) possible deviation band (about the desired value) of the system response, under feedback control. An angular position servo uses a resolver (see Chapter 5) as its feedback sensor. If peak-to-peak oscillations of the servo load (the plant) under steady-state conditions have to be limited to no more than 2 degree, what is the worst tolerable resolution of the resolver? Note: In practice, the feedback sensor should have a resolution better (smaller) than this worst value.

Explanation / Answer

resolution of a feedback sensor means the smallest change that is detect by system while measuring.It is related to precision.

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